Hash of rendering options to pass to OptionParser. If the key :output_class is
passed, that class’s Hirb config will serve as defaults for this
rendering hash.

:option_command

Boolean to wrap a command with an OptionCommand object i.e. allow commands to
have options.

:args

Should only be set if not automatically set. This attribute is only
important for commands that have options/render_options. Its value can be
an array (as ArgumentInspector.scrape_with_eval
produces), a number representing the number of arguments or ’*’
if the command has a variable number of arguments.

:default_option

Only for an option command that has one or zero arguments. This treats the
given option as an optional first argument. Example: